Carburetor heat control



Oct. 11, 1932. v I F. PURDY 1,881,940

CARBURETOR HEAT CONTROL Filed June 24, 1929 2 Sheets-Sheet 1 Oct. 11, 1932. F. PURDY 1,881,940

CARBURETOR HEAT CONTROL Filed June 24, 1929 2 Sheets-Sheet 2 QITg- 2 Patented Oct. 11, 1932 I v i emmsi s PATENT amc i rnnnnnrox runnY, or FLINT, MICHIGAN, ASSIGNOR 'IO ARVE eimnunn'rna COMPANY, 01* rnmnnromelimn CORPORATION or IjLmnoIs V GARBUBETQR HEAT co'nrnor. f Application filed June 4,1929. Serial No. 373,220. 7 i

This invention relates to means for controlmanifolding system embodying the features ling the heat supplied tothe carburetted mixof this invention. i a i Hi ture during its passage to'the cylinders of an a Figure 2 isasection, on the line IIII of internal combustion engine. 1 w Figure 1. u i i 1 5 One of the objects of thisinvention is to V Figure 3 is a section on the line III-III provide an improved and simplified heat conof Figure 2. a a J trol'for the explosive charge or carburetted As shown on the drawings: mixture.

The present invention relates to a simplibustion engines is shown in Figure 1 wherein a lied and improved induction system wherein an exhaust manifold, designated generally- 6 an enlarged portion of the conduit has apart by the reference numeral 10 collects the exof its perimeter heated while another portion haust gases through four. branches 11 leading is relatively cold, and in which a displacing to ports in the cylinder block, which isjnot body of low heat conductivity may be intershown in the drawings. Inthis particular posed between theflowing stream of mixture manifolding system no manifold as such is 5 and various parts of the walls of the-conduit shown for the intake or carburetion system, so that the stream-may be subjected to a the distribution being taken care of by. pas- V variety of temperatures coincidently with sages in the cylinder block, The carburetion various positions of the carburetor throttle. system comprises a carburetor 12 having a A manifolding system for internal como Another object of this invention is to prothrottle valve 13 on a'shaft 14: and a mount- 7 vide a combined exhaust manifold and intake ing' flange 15 attached to a Similar flange 16 V passage wherein a portion of the periphery on an elbow fitting 17 which in turn is seof the intake passage is exposed to the exhaust cured atthe inlet to a cross passage 18'begases, and to provide diversion means within neath and formed integral with the exhaust mixture flow relative to the heated portion This passage is formed of an areaapproxiof said passage. mately double the carburetor outlet area and A th bj t f thi i ti i t terminates in a restricted outlet flange 19, of

vide a combined exhaust manifold and inpp i y ar a 0f thecal'buletofmlti 30 take passage wherein awportion of the pe hfla g fis a p t bBafBtBJCh-Bd riphery of the intake passageis exposed to to g Pyl f block t to the exhaust gases, and to provide diversion the m egp sages e -i n eans within said intake passage for Varying The Cross p g Whlle' l *Wlth the path of re flow rehtive to the heat the exhaust manifold, has the lower half 20 ed portion of said passage.

A further object of this invention is to provide a simplified and improved heat control ofthe type'described that can be economically manufactured and will be reliable in Servlce' s. half 21 the exhaust manifold iss eeiall conamlfurther lmportant Oblects thls toured to form a widened relatiiiely 'sh iillow' mveniflon W111 f -PP P l' the (115910 passage 22 above the top wall 21 and is prosures 1n the specificatlon and the accompanyid d ith ket 23 t di t Way Y a a down the sides ofthe intake passage. *Thus Thls 11117611171011 Eb preferred form). 1s 11- the upper half ofthe passage 18 is subjected lustrated in the drawings and hereinafter to the direct heat of the exhaust gases from more fully described. half the engine cylinders whenthe carburetor On the drawings: 1 r 1 is symmetrically disposed. -Moreor'lessheat Figurell is a side elevationof an engine; may be obtained by shifting the carburetor which in consequence is not directly heated by the exhaust gases; while the-upperhalf 21 of the wall forms an integral hot spot with exhaust-gases on one side. In order,

said intake passage for varying thepath of manifold 10 between the inner branches 11175 of its wall formed as an external surface vto distribute the exhaust heat overtheupper comprises a shaftfl l axially mounted relative to the passage 18 and carrying a diametrically disposed partition -having--semicircular end closures 26 and 27-which contact the wall of this passageand the restricted outlet respectively, the whole forming in 1 effect a semicylindrical plug obstructing onehalf of'the passage. By suitably rotating this plug the mixture may" be caused to flow in contact with different portions of the wall of the passage 18 thus providing a full range of heat control;

' Broadly, thes'haft 24 maybe rotated or oscillated in any suitable manneras by a manual control if it is deslred to compensate forgeneral operating conditions, such as temperature. Specifically, I havechosen to illustratea control of the heating effect in proportio'njto" the throttle movement, as it iswell known that much less heating is desirable at full throttle than is required to obtain smooth idling at nearly closed throttle.

The illustrated control comprises intere'ng'aging gear segments 28 and 29 mounted on the throttle shaft and control shaft respectively.

If the throttle shaft has a total movement of GO' deg-rees and a half turn of the control -sha'ft is'desired a three to one gear ratio will give the desired'movement. Also, if it is a desired to vary the proportional movement of the controlshaft relative the throttle at" different degrees of opening of the latter, segments'of elliptical or Geneva gears may be employed to produce the desired result.

In the operation of this device, when the plug valve in the passage 18 is-in the position shown in Figure 2, corresponding to a full throttle opening, the 'carburetted mixture flows through the lower half'of the passage 18, in contact with the unheated wall 20. The

hollow effect of the plug valve serves as a "dead airinsulating space which materially 7 reduces the transmission of heat to the mixture from the upper heated half of the pas sage 18, so that in this'position of the valve the mixture is relatively unheated, more err pecially so as the maximum volume of mixture is flowing at high speed. throttle is closed for idling the interconnected control shaft is rotated substantially 180 de- 'grees by the throttle movement, thus positioning the plugvalve in the lower half of the passage 18, thus causing the mixture to was 'flow'in the upper heated portion of the passagein contact-with the wall 21. As the mixture flow is-at a minimum during idling; the

when the heating efiect thereon will be augmented by the slow travel of the mixture through the heating zone. At intermediate positions of the control shaftuand plug valve the heating effect will be varied in proportion to the relative exposed areas of the heated and unheated walls of the passage 18. I

t It will thus be seen that I have providedan improved and simplified, variable heating control for the carburetted mixture supplied ""to internalcombustionengines, which con- -trol does not depend upon-the throttling or control of the heating fluid per se.

i I =amaware that many changes may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention,and'I, therefore, do notpurpose limiting the patent granted hereon, otherwise than necessitate d the prior art.

'I claim as invention 1. A carburetting system for lnternal combustion engines includinga carburetting device, a tube forming a mixture passage connected to said" carburetting device, heating means rassociatedvw ith said-tube to heat the same, and meansdisposed within saidtube for causing the mixture flowing therethrough to be moved intoand out of contact with the heated portion of the circumference of said tube, said latter means including a pivotal element for bodily moving the path of the mixture flow into and out of a positionwhere said mixture may be acted upon by said heat Y inn ing'means. g

2. A carburettrng'system for internal combustion engines including a carburetting device, a tube forming a mixture passage connected to said carburetting device, heating means associated with said tube to heat the u same, means disposed within said tubefor causing the mixture flowingtherethrough 'tobe moved into and out of contact with the heated portion or thecircumference of said tube, said latter means including a rotatable segmental element occupyinga portion of the space within said tube whereby rotation thereof will bodily shiftfth'e path of the mixture flow within said tube into and out of a position where said mixture may be acted upon by said heating-means.

3. A carburetting system for internal combustion engines includingr'a carburettingdevice, atube forming a mixture passage connected to said carburetting device, heating means associated with said tube to heat a portioniof the circumference thereof, means disposed within said tube for causing the mixture flowing therethrough to be'moved into and out of contact withthe heated portion" of the circumference of said tube, said latter means including a'pivotal element for bodily moving the path of the mixture flow into and out of a position where said mixture may be acted upon by said heatmgmeans.

1,881,940 r I I 3 i. A. carburetting system for internal com bustion engines including a carburetting device, a tube forming a mixture passage connected to said carburetting device, heating means associated with said tubeto heat a portion of the circumference thereof, means disposed within said tube for causing the mixture flowing therethrough to be moved into and out of contact with the heated portion of the circumference of said tube, said latter means including a rotatablesegmental element occupying a portion of the space within said tube wherebyrotation thereof will bod-, ily shift the path of the mixture flow within said tube into and out of a position where said mixture may be acted upon by said heating means. V

5. In a carburetting system for internal combustion engines, a tube through which the carburetted mixture flows on its way to the engine, heating means associated with V the tube, means disposed within said tube vof, means disposed within said tube for varying the path of the flowing mixture to cause it to be moved into and out of the direct heating. zone of said heating means, said latter means including a pivotal element for bodily moving the path of the mixture flow into andout of a positionwhere said mixture may be acted upon by said heating means.

7 In a carburetting system for internal combustion engines, a tube through which the carburetted mixture flows on its way to the engine, heating means associated with the tube for heating a portion of the wall thereof, means disposed within said tube for varying the path of the flowing mixture to cause it to be moved into and out of the direct heating zone of said heating means, said latter means including a rotatable segmental element occupying a portion of the space within said tube whereby rotation thereof will bodily shift the path of the mixture flow within said tube into and out of a position where said mixture may be acted upon by said heating means.

8. In a carburetting system for internal combustion engines, a tube through which the carburetted mixture flows on its Way to the engine, heating means associated with cause it to be moved into and out of the directheating zone of said heating means, said latter means including a rotatable, segmental element occupying a portion of the space within said tube whereby rotation thereof will bodily shift the path of the mixture flow within said tube into and out of a position where said mixture may be acted upon by said heating means.

9. In a carburetingsystem for an internal combustion engine, an intake tube between V the carburetor and the engine, heating means enveloping a sector of said tube, and a rotatale element in said tube defining a mixture passage and locating said passage adjacent any desired portion of said enveloped sector.- 10. In a carbureting system foran internal combustion engine, an intaketube between the carburetor and the engine, heating means enveloping a sector of said tube, an element in said tube defining a mixture passage, and

means for rotating said element whereby said mixture passage is brought into and out of contiguity with said enveloped sector. I

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

Illinois.

' FREDERICK PUBDY.

the tube, means disposed within said tube for V varying the path of the flowing mixture to 

